Test Placemark elements wrapped as features
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    >>> kmlfile = open_file('archaic.kml')
    >>> from elementtree import ElementTree as etree
    >>> kmltree = etree.parse(kmlfile)
    >>> kmlns = kmltree.getroot().tag.split('}')[0][1:]
    >>> placemarks = [p for p in kmltree.findall('*/{%s}Placemark' % kmlns)]
    >>> from keytree import feature
    >>> f = feature(placemarks[0])
    >>> f.geometry.type
    'Point'
    >>> print f.geometry.coordinates
    (21.9725, 32.896..., 0.0)
    >>> gi = f.__geo_interface__
    >>> gi['geometry']['type']
    'Point'
    >>> print gi['geometry']['coordinates']
    (21.9725, 32.896..., 0.0)
    >>> gi['properties']['name']
    'Apollonia/Sozousa/Portus Cyrenorum'
